`doubletree.at`

DNSSEC	⚠️ Not signed
A	167.187.200.18^{🇺🇸 AS26529167.187.200.0/22 AC_HILTONWORL}
		PTR	`ftcrdf-nonsecure.hilton.com`
		PTR	`richardsondallas.hilton.com`
		PTR	`uksupply.hilton.com`
NS	`ns1.markmonitor.com` ⭐
		A	2620:10a:80a8::1^{🇨🇦 CIRA-22620:10a:80a8::/48 markmonitor v6 cloud1 979 Bank Street, Suite 400 Ottawa ON K1S 5K5 Canada}
		A	149.112.160.1^{🇨🇦 CIRA-2149.112.160.0/24 markmonitor v4 cloud1 979 Bank Street, Suite 400 Ottawa ON K1S 5K5 Canada}
NS	`ns2.markmonitor.com`
		A	2001:67c:10b8::1^{🇨🇭 RCODEZERO-ANYCAST-SEC22001:67c:10b8::/48 IPCOM-anycast-net}
			PTR	`ns2.markmonitor.com`
		A	176.97.158.1^{🇦🇹 RCODEZERO-ANYCAST-SEC2176.97.158.0/24 NICat-anycast-net}
			PTR	`ns2.markmonitor.com`
NS	`ns3.markmonitor.com`
		A	2620:10a:80a9::1^{🇨🇦 CIRA-32620:10a:80a9::/48 markmonitor v6 cloud2 979 Bank Street, Suite 400 Ottawa ON K1S 5K5 Canada}
		A	149.112.161.1^{🇨🇦 CIRA-3149.112.161.0/24 markmonitor v4 cloud2 979 Bank Street, Suite 400 Ottawa ON K1S 5K5 Canada}
NS	`ns4.markmonitor.com`
		A	2001:67c:1bc::1^{🇦🇹 RCODEZERO-ANYCAST-SEC1-TLD2001:67c:1bc::/48 IPCom-NET Anycast}
			PTR	`ns1.markmonitor.com`
		A	192.174.68.1^{🇦🇹 RCODEZERO-ANYCAST-SEC1-TLD192.174.68.0/24 NICat-anycast-net}
			PTR	`ns1.markmonitor.com`
NS	`ns5.markmonitor.com` ⚠️ Not in parent delegation
		A	2620:10a:80a8::2^{🇨🇦 CIRA-22620:10a:80a8::/48 markmonitor v6 cloud1 979 Bank Street, Suite 400 Ottawa ON K1S 5K5 Canada}
		A	149.112.160.2^{🇨🇦 CIRA-2149.112.160.0/24 markmonitor v4 cloud1 979 Bank Street, Suite 400 Ottawa ON K1S 5K5 Canada}
NS	`ns6.markmonitor.com` ⚠️ Not in parent delegation
		A	2001:67c:10b8::3^{🇨🇭 RCODEZERO-ANYCAST-SEC22001:67c:10b8::/48 IPCOM-anycast-net}
			PTR	`ns6.markmonitor.com`
		A	176.97.158.3^{🇦🇹 RCODEZERO-ANYCAST-SEC2176.97.158.0/24 NICat-anycast-net}
			PTR	`ns6.markmonitor.com`
NS	`ns7.markmonitor.com` ⚠️ Not in parent delegation
		A	2620:10a:80a9::2^{🇨🇦 CIRA-32620:10a:80a9::/48 markmonitor v6 cloud2 979 Bank Street, Suite 400 Ottawa ON K1S 5K5 Canada}
		A	149.112.161.2^{🇨🇦 CIRA-3149.112.161.0/24 markmonitor v4 cloud2 979 Bank Street, Suite 400 Ottawa ON K1S 5K5 Canada}
SOA	`ns1.markmonitor.com`hostmaster@markmonitor.com 2024-01-25 #1

`at`

	DNSSEC	🔒 Signed (DS record present)
	NS	`dns.nic.at` ⭐
	NS	`d.ns.at`
	NS	`j.ns.at`
	NS	`n.ns.at`
	NS	`ns1.univie.ac.at`
	NS	`ns2.univie.ac.at`
	NS	`r.ns.at`
	NS	`u.ns.at`
	SOA	`dns.nic.at`domain-admin@univie.ac.at serial=1785261602

Same first word

DNS History

15 records (8 active, 7 former)

●NSns1.markmonitor.com2026-07-27 → 2026-07-28 · 3 obs

○ 2017-05-27 13:31:46
● 2026-07-27 12:29:20
● 2026-07-28 18:04:10

○NSns1.netnames.net2015-08-03 → 2017-05-27 · 4 obs

● 2015-08-03 20:58:16
● 2017-05-27 13:31:46
○ 2026-07-27 12:29:20
○ 2026-07-28 18:04:10

●NSns2.markmonitor.com2026-07-27 → 2026-07-28 · 3 obs

○ 2017-05-27 13:31:46
● 2026-07-27 12:29:20
● 2026-07-28 18:04:10

○NSns2.netnames.net2015-08-03 → 2017-05-27 · 4 obs

● 2015-08-03 20:58:16
● 2017-05-27 13:31:46
○ 2026-07-27 12:29:20
○ 2026-07-28 18:04:10

●NSns3.markmonitor.com2026-07-27 → 2026-07-28 · 3 obs

○ 2017-05-27 13:31:46
● 2026-07-27 12:29:20
● 2026-07-28 18:04:10

●NSns4.markmonitor.com2026-07-27 → 2026-07-28 · 3 obs

○ 2017-05-27 13:31:46
● 2026-07-27 12:29:20
● 2026-07-28 18:04:10

●NSns5.markmonitor.com2026-07-27 → 2026-07-28 · 3 obs

○ 2017-05-27 13:31:46
● 2026-07-27 12:29:20
● 2026-07-28 18:04:10

○NSns5.netnames.net2015-08-03 → 2017-05-27 · 4 obs

● 2015-08-03 20:58:16
● 2017-05-27 13:31:46
○ 2026-07-27 12:29:20
○ 2026-07-28 18:04:10

●NSns6.markmonitor.com2026-07-27 → 2026-07-28 · 3 obs

○ 2017-05-27 13:31:46
● 2026-07-27 12:29:20
● 2026-07-28 18:04:10

○NSns6.netnames.net2015-08-03 → 2017-05-27 · 4 obs

● 2015-08-03 20:58:16
● 2017-05-27 13:31:46
○ 2026-07-27 12:29:20
○ 2026-07-28 18:04:10

●NSns7.markmonitor.com2026-07-27 → 2026-07-28 · 3 obs

○ 2017-05-27 13:31:46
● 2026-07-27 12:29:20
● 2026-07-28 18:04:10

○MXrelay1.netnames.net2015-08-03 → 2017-05-27 · 4 obs

● 2015-08-03 20:58:16
● 2017-05-27 13:31:46
○ 2026-07-27 12:29:20
○ 2026-07-28 18:04:10

○MXrelay2.netnames.net2015-08-03 → 2017-05-27 · 4 obs

● 2015-08-03 20:58:16
● 2017-05-27 13:31:46
○ 2026-07-27 12:29:20
○ 2026-07-28 18:04:10

●A167.187.200.182026-07-27 → 2026-07-28 · 3 obs

○ 2017-05-27 13:31:46
● 2026-07-27 12:29:20
● 2026-07-28 18:04:10

○A185.26.230.1292015-08-03 → 2017-05-27 · 4 obs

● 2015-08-03 20:58:16
● 2017-05-27 13:31:46
○ 2026-07-27 12:29:20
○ 2026-07-28 18:04:10

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
at	ns2.univie.ac.at, d.ns.at, n.ns.at, j.ns.at...	-
doubletree.at	ns1.markmonitor.com, ns2.markmonitor.com, ns3.markmonitor.com, ns4.markmonitor.com	-

✅ Authoritative Response

Server:192.174.68.1

NS records: ns1.markmonitor.com, ns2.markmonitor.com, ns3.markmonitor.com, ns4.markmonitor.com

🔒 DNSSEC Status

❌ Bogus (DNSSEC validation failed)

Validation error at at: Error: DNS query timeout: 192.92.125.2 for DNSKEY at

⏱️ Timing

Total: 3686ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`167.187.200.18`
NS	7	`ns2.markmonitor.com, ns7.markmonitor.com...`
SOA	1	`ns1.markmonitor.com hostmaster.markmonit`

Analysis

IP Addresses

doubletree.at resolves to just one IP address, 167.187.200.18.

Two other host names, along with westloop.hilton.com, tampadoubletree.com and hiltonpalm.com, also share IP numbers with doubletree.at.

Name Servers

doubletree.at has 7 name servers — ns1.markmonitor.com, ns2.markmonitor.com, ns3.markmonitor.com and 4 others.

There is at least partial name server overlap between doubletree.at and other domains — sellingitintheatl.com, ciscosystems.com.ro, gawker.com.hk and two more among them.

These name servers tend to appear in combination with the name servers ns4.markmonitor.com, ns5.markmonitor.com, ns6.markmonitor.com and ns7.markmonitor.com.

Host names that have two IP addresses:

ns1.markmonitor.com resolves to 149.112.160.1 and 2620:10a:80a8::1.

ns2.markmonitor.com resolves to 176.97.158.1 and 2001:67c:10b8::1.

ns3.markmonitor.com resolves to 149.112.161.1 and 2620:10a:80a9::1.

ns4.markmonitor.com resolves to 192.174.68.1 and 2001:67c:1bc::1.

ns5.markmonitor.com resolves to 149.112.160.2 and 2620:10a:80a8::2.

ns6.markmonitor.com resolves to 176.97.158.3 and 2001:67c:10b8::3.

ns7.markmonitor.com resolves to 149.112.161.2 and 2620:10a:80a9::2.